Dinosaur hunter Reggie Rivers and his partner, the Raja, organize time-travel safaris in a world with a Hawking-style chronological protection principle.
Oh, I’m no four-dimensional thinker; but, as I understand it, if people could go back to a more recent time, their actions would affect our own history, which would be a paradox or contradiction of facts. Can’t have that in a well-run universe, you know.

Tags

(3)

Variants

(1)
  1. “A Gun for Dinosaur” by L. Sprague de Camp, in Galaxy, March 1956.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by L. Sprague de Camp